David Beckham's alleged former mistress is set to reveal more details about their sex life.

Rebecca Loos - who claimed to have had an affair with the soccer star while he played for Spanish giants Real Madrid in the 2003-04 season - will appear on U.K. TV show "Generation Sex" to talk about their alleged relationship.

A source said: "It's highly likely that Beckham will be mentioned. After all it's what made her famous."

Rebecca - who is openly bisexual - claimed to have slept with David while she worked as his personal assistant when he moved to Spain.

However, David - who has three sons, Brooklyn, nine, Romeo, five, and three-year-old Cruz with Spice Girl wife Victoria - has always denied the claims.

Rebecca recently insisted her alleged affair with David had made his marriage to Victoria stronger.

She said: "In a way they should be glad it happened - it's made them stronger. They even went on to have another child. Everything happens for a reason, even bad things.

"I think their marriage is stronger than ever. Victoria's stuck by David and that's the main thing."